books what is hard water
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# Hard water hyacinth
# Use hard water
# Irrigation with hard water
# Methods for treating hard water
# Modeling the hard categories
# hard child
# water hardness
# Water hardness chemistry
# Water hardness problem
# Types of water hardness
# water softener
# remove water hardness
# hard water arrow
# What is the benefit of drinking water?
# What are the benefits of drinking cold water?
# Where does a camel store water?
# How do plants absorb water?
# What is the importance of having water?
# What is the boiling point of water?
# What is the benefit of drinking hot water?
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ما هو الماء العسر (Info)
هو الماء المحتوي على أملاح الكالسيوم أو المغنسيوم المذابة - وهي أملاح تمنع رغوة الصابون وتؤدي إلى فقدانه القدرة على استحلاب الدهون ( الأقذار ) إلا بعد استهلاك كمية كبيرة في الاتحاد بهذه الأملاح
